Domain report: rsm.nl

Registration

info

.nl country-code · Erasmus Universiteit Rotterdam

Found

TLD: .nl (country-code)
ICANN policies apply: no
Registrar: Erasmus Universiteit Rotterdam
Registered: 26 March 1997
Last changed: 11 November 2025
Status: active
Registry nameservers: ns1.surfnet.nl, ns1.zurich.surf.net, ns2.surfnet.nl, ns3.surfnet.nl
RDAP server: https://rdap.sidn.nl/

Checks

i

.nl is a country-code TLD (ccTLD)

Country-code TLD: governed by its local registry under national policy, not by an ICANN contract. Registrar accreditation, dispute resolution and RDAP/WHOIS rules are set by the registry.

#1
✓ TLD delegated and signed #2

.nl is delegated in the root zone and DNSSEC-signed.
i

Expiry date not published

The registry does not publish the expiry date in RDAP. Check it with your registrar.

#3
i

No transfer lock

The domain has no transfer lock (status: active). A registrar lock protects against unauthorized transfers.

#4
✓ Registry and delegation match #5

The nameservers registered at the registry are the ones published in DNS.

Delegation

pass

ns1.surfnet.nl, ns1.zurich.surf.net, ns2.surfnet.nl, ns3.surfnet.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns1.surfnet.nl, ns1.zurich.surf.net, ns2.surfnet.nl, ns3.surfnet.nl
NS in the zone: ns1.surfnet.nl, ns1.zurich.surf.net, ns2.surfnet.nl, ns3.surfnet.nl

Nameserver	Addresses	Network (AS)	Glue
ns1.surfnet.nl	192.87.106.101 2001:610:1:800a:192:87:106:101	AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL	192.87.106.101 2001:610:1:800a:192:87:106:101
ns1.zurich.surf.net	195.176.255.9 2001:620:0:9::1103	AS559 Switch - SWITCH, CH AS559 Switch - SWITCH, CH	-
ns2.surfnet.nl	192.87.36.2 2001:610:3:200a:192:87:36:2	AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL	192.87.36.2 2001:610:3:200a:192:87:36:2
ns3.surfnet.nl	195.169.124.71 2001:610:0:800c:195:169:124:71	AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL	195.169.124.71 2001:610:0:800c:195:169:124:71

Checks

✓ 4 nameservers #6

Delegated to ns1.surfnet.nl, ns1.zurich.surf.net, ns2.surfnet.nl, ns3.surfnet.nl.
✓ Parent and zone agree #7

The parent delegation and the zone's NS records list the same nameservers.
✓ No glue needed #8

All nameservers are outside the zone, so no glue records are needed.
✓ All names resolve #9

Every nameserver name has an address and is not an alias.
✓ Nameservers in different networks #10

The nameservers are spread over 4 IPv4 /24s and 4 IPv6 /48s.
✓ 2 autonomous systems #11

The nameservers are spread over: AS1103 (SURFNET-NL - SURF B.V., NL): 6 addresses; AS559 (Switch - SWITCH, CH): 2 addresses.
✓ Nameserver names under 2 TLDs #12

Nameserver names use the TLDs .net, .nl.
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

Nameservers

info

8 of 8 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.surfnet.nl 192.87.106.101	NOERROR, 9 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns1.surfnet.nl 2001:610:1:800a:192:87:106:101	NOERROR, 9 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns1.zurich.surf.net 195.176.255.9	NOERROR, 9 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surf.nl
ns1.zurich.surf.net 2001:620:0:9::1103	NOERROR, 9 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surf.nl
ns2.surfnet.nl 192.87.36.2	NOERROR, 12 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns2.surfnet.nl 2001:610:3:200a:192:87:36:2	NOERROR, 12 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns3.surfnet.nl 195.169.124.71	NOERROR, 10 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns3.surfnet.nl 2001:610:0:800c:195:169:124:71	NOERROR, 10 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl

Checks

✓ All respond #14

All 8 nameserver addresses answered.
✓ All authoritative #15

Every responding nameserver answers authoritatively for the zone.
✓ No recursion #16

The nameservers do not answer recursive queries for other domains.
i

Identifying string disclosed

These nameservers answer version queries with a string that is not a version number: ns1.surfnet.nl: "This is a SURFnet nameserver - dns-beheer@surfnet.nl"; ns1.zurich.surf.net: "This is a SURFnet nameserver - dns-beheer@surf.nl"; ns2.surfnet.nl: "This is a SURFnet nameserver - dns-beheer@surfnet.nl"; ns3.surfnet.nl: "This is a SURFnet nameserver - dns-beheer@surfnet.nl".

#17
✓ Zone transfers refused #18

No nameserver allows a zone transfer to the public.
✓ TCP supported #19

All nameservers answer over TCP.
✓ EDNS supported #20

All nameservers support EDNS(0).
✓ Public addresses #21

All nameserver addresses are publicly routable.

SOA

info

serial 2014281793 · primary ns6.eur.nl

Found

Primary (MNAME): ns6.eur.nl
Contact (RNAME): dnsmaster.nic.eur.nl
Serial: 2014281793
Refresh / retry: 86400 s / 3600 s
Expire: 2419200 s
Negative TTL: 900 s

Serial per nameserver

Nameserver	Serial
ns1.surfnet.nl (192.87.106.101)	2014281793
ns1.surfnet.nl (2001:610:1:800a:192:87:106:101)	2014281793
ns1.zurich.surf.net (195.176.255.9)	2014281793
ns1.zurich.surf.net (2001:620:0:9::1103)	2014281793
ns2.surfnet.nl (192.87.36.2)	2014281793
ns2.surfnet.nl (2001:610:3:200a:192:87:36:2)	2014281793
ns3.surfnet.nl (195.169.124.71)	2014281793
ns3.surfnet.nl (2001:610:0:800c:195:169:124:71)	2014281793

Checks

✓ Serial 2014281793 everywhere #22

All nameservers serve the same version of the zone.
✓ Timers within recommendations #23

SOA refresh 1d, retry 1h, expire 28d, negative TTL 15m.
i

Hidden master

The primary nameserver ns6.eur.nl is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.

#24
✓ Contact dnsmaster@nic.eur.nl #25

The SOA RNAME dnsmaster.nic.eur.nl means dnsmaster@nic.eur.nl.
✓ Timestamp serial #26

The serial 2014281793 is a Unix timestamp (2033-10-30 10:43 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 9-byte salt
Signatures valid until: 25 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
51415	RSASHA256 (8)	SHA256 900F10E0DC869C52…	NO
64525	RSASHA256 (8)	SHA256 6044026FD219F1CF…	NO
63907	RSASHA256 (8)	SHA256 9593AB0CF47C3E46…	NO
62215	RSASHA256 (8)	SHA256 56DF11E69D6543CA…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
42405	ZSK (256)	RSASHA256 (8)
45013	ZSK (256)	RSASHA256 (8)
62215	KSK (257)	RSASHA256 (8)

Checks

✓ Signed and validated #27

The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
i

Unused DS records

These DS records match no key in the zone: key tag 51415 (SHA256), key tag 64525 (SHA256), key tag 63907 (SHA256). That is normal during a key rollover; otherwise remove them.

#28
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Short-lived signatures (online signing) #30

Signatures are valid for 97h0m0s and created on demand; the current one was made at 2026-10-21 16:25 UTC and expires at 2026-10-25 17:25 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 9-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.

#31

Records

pass

25 records at the apex

Found

Read from: 192.87.106.101:53

Type	Value	TTL
SOA	ns6.eur.nl. dnsmaster.nic.eur.nl. 2014281793 86400 3600 2419200 900	28800
NS	ns1.zurich.surf.net.	28800
NS	ns3.surfnet.nl.	28800
NS	ns2.surfnet.nl.	28800
NS	ns1.surfnet.nl.	28800
A	94.228.129.194	28800
AAAA	2a00:d00:ff:129:94:228:129:194	28800
MX	0 rsm-nl.u-v1.mx.microsoft.	600
TXT	"atlassian-domain-verification=kURX4B7iRnGEndh49X3Y8rq2tTKFeUqiqh2n6sCvxAgB7mN5kIgFkEKhN1/Bq6h4"	300
TXT	"v=easydus; cg=04ecf8d2-98be-49aa-b957-a6f37cec9d32"	300
TXT	"r6FixzCbViCeI/XVodX0GL7DmsuGH44snbGlQF2C8KBegkO+MNhk6CQIvz3GeAnG4vApiWSSKrOPUKvp+/Gd9Q=="	300
TXT	"HARICA-cEzSNCboI7niOXSa10c"	300
TXT	"knowbe4-site-verification=8651a70f5f58b2b32967001e2104de85"	300
TXT	"d365mktkey=VpaklDC8AgHWNX2PkxtpvxvvqP1ClYfuSrX3LveSJmIx"	300
TXT	"adobe-idp-site-verification=5d3a6228d29e80cf1fe4d4a5780ebd08c45fc8e741b748a0d7e664137ce90cc3"	300
TXT	"v=msv1 t=410a929a9ba34a962ea3b9179aa6b1"	300
TXT	"ZOOM_verify_qd4QsvIcRIuIOZ3rfcNFCQ"	300
TXT	"miro-verification=3398bd3172ee4fdacc0f52cbb57f29046f36b258"	300
TXT	"v=spf1 include:spf.protection.outlook.com include:_spf.ubeeo.nl ip4:94.228.129.0/24 include:customers.clickdimensions.com include:_spf.questback.com include:spf.flowmailer.net include:spf.mailcamp.nl ip4:145.5.189.2 -all"	300
TXT	"atlassian-sending-domain-verification=6a6ac96a-d058-4842-85c3-9bcd441fc9c9"	300
TXT	"apple-domain-verification=PLiFr2Jyr58cSq8s"	300
CAA	0 iodef "mailto:cert@eur.nl"	28800
CAA	0 issue "harica.gr"	28800
CAA	0 issuewild "harica.gr"	28800
CAA	0 issue "letsencrypt.org"	28800

Checks

✓ TTLs within range #32

TTLs: A 8h, AAAA 8h, MX 10m, NS 8h. The NS TTL at the parent is 1h and in the zone 8h; resolvers may use either.
✓ No CNAME at the apex #33

The zone apex has no CNAME record.
✓ No wildcard #34

Names that don't exist return NXDOMAIN.
✓ CAA restricts issuance #35

Certificates may be issued by: harica.gr, letsencrypt.org.